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1) Biological networks are very energy efficient
2) Our intelligence(not perfect, but enough to spread our genes) was achieved by simulating organisms billions of times in a perfectly simulated environment, with a perfect loss function. We don't have the resources to simulate such a big amount of agents, our environment is a generalization of the real world and the loss function is far from perfect.
3) Most of the progress was done in narrow AI and almost no one researches the principles of growing intelligence, and the already existent structure of the network(nature + nurture)